Details

Autor(en) / Beteiligte

• Straatman, Caroline M. S.
• Wel, Arjen van der
• Bezanson, Rachel
• Pacifici, Camilla
• Gallazzi, Anna
• Wu, Po-Feng
• Noeske, Kai
• Bariši, Ivana
• Bell, Eric F.
• Brammer, Gabriel B.
• Calhau, João
• Chauke, Priscilla
• Franx, Marijn
• Houdt, Josha van
• Labbé, Ivo
• Maseda, Michael V.
• Muñoz-Mateos, Juan C.
• Muzzin, Adam
• Sande, Jesse van de
• Sobral, David
• Spilker, Justin S.

Titel

The Large Early Galaxy Astrophysics Census (LEGA-C) Data Release 2: Dynamical and Stellar Population Properties of z 1 Galaxies in the COSMOS Field

Ist Teil von

• The Astrophysical journal. Supplement series, 2018-12, Vol.239 (2), p.27

Ort / Verlag

Saskatoon: The American Astronomical Society

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present the second data release of the Large Early Galaxy Astrophysics Census (LEGA-C), an ESO 130−night public spectroscopic survey conducted with VIMOS on the Very Large Telescope. We release 1988 spectra with typical continuum S/N 20 −1 of galaxies at 0.6 z 1.0, each observed for ∼20 hr and fully reduced with a custom-built pipeline. We also release a catalog with spectroscopic redshifts, emission-line fluxes, Lick/IDS indices, and observed stellar and gas velocity dispersions that are spatially integrated quantities, including both rotational motions and genuine dispersion. To illustrate the new parameter space in the intermediate-redshift regime probed by LEGA-C, we explore relationships between dynamical and stellar population properties. The star-forming galaxies typically have observed stellar velocity dispersions of ∼150 km s−1 and strong Hδ absorption (HδA ∼ 5 ), while passive galaxies have higher observed stellar velocity dispersions (∼200 km s−1) and weak Hδ absorption (HδA ∼ 0 ). Strong [O III]5007/Hβ ratios tend to occur mostly for galaxies with weak HδA or galaxies with higher observed velocity dispersion. Beyond these broad trends, we find a diversity of possible combinations of rest-frame colors, absorption-line strengths, and emission-line detections, illustrating the utility of spectroscopic measurements to more accurately understand galaxy evolution. By making the spectra and value-added catalogs publicly available we encourage the community to take advantage of this very substantial investment in telescope time provided by ESO.